Journal of Technologic Dentistry (대한치과기공학회지)

Korean Academy of Dental Technology (대한치과기공학회)
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Ceramic color differences of dental Ni-Cr alloy by compositional change

치과용 Ni-Cr 합금의 조성에 따른 세라믹의 색차 분석

  • Kim, Sa-Im (SSen Dental Laboratory) ;
  • Kim, Tae-Yeon (Department of Dental Biomaterials and Institute of Biodegradable Material, School of Dentistry, Jeonbuk National University) ;
  • Kim, Se-Ha (Department of Dental Biomaterials and Institute of Biodegradable Material, School of Dentistry, Jeonbuk National University) ;
  • Kang, Jeong-Gyu (Department of Dental Laboratory Technology, Gwangju Health University) ;
  • Lee, Jung-Hwan (Department of Dental Laboratory Technology, Gwangju Health University)
  • 김사임 (쎈 치과기공소) ;
  • 김태연 (전북대학교 치과대학 치과생체재료학교실) ;
  • 김세하 (전북대학교 치과대학 치과생체재료학교실) ;
  • 강정규 (광주보건대학교 치기공학과) ;
  • 이정환 (광주보건대학교 치기공학과)
  • Received : 2021.11.01
  • Accepted : 2021.12.21
  • Published : 2021.12.30
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Abstract

Purpose: This study was conducted to investigate alloys spectrophotometrically including yttrium of nickel-chromium (Ni-Cr) alloys, which are used as substitutes for the regulation of beryllium and provide helpful improvements in Ni-Cr alloys. Methods: Four groups of specimens (ZN, ZY, SN and EM) were prepared for analysis. Color parameters were measured with a spectrophotometer, and color difference (∆E*) was calculated. The t-test and one-way analysis of variance test were used to determine significant difference, and the Tukey test was used to identify where the differences were. To measure the spectroscopic reflectivity, the spectroscopic reflectance was measured and converted into CIE L*, a*, b* color system. Results: The ∆E* value of each metal ceramic group after opaque firing of Ni-Cr alloy with and without yttrium was <2, and the total group color difference (∆E*) was below 1 in the dentin ceramic all experimental group. However, the a* and b* values of the metal ceramic groups were higher than that in the lithium disilicate all ceramic group, and the chroma was higher than the natural tooth. The brightness of all experimental groups was similar to that of the shade guide sample. Conclusion: Yttrium added to Ni-Cr alloys showed similar CIE L*, a*, b* values to Ni-Cr alloys that did not contain yttrium, indicating that yttrium had no effect on color in metallic ceramic systems.

Keywords

Acknowledgement

본 연구는 김사임(2019)의 남부대학교 석사학위논문 '치과용 Ni-Cr 합금의 조성에 따른 세라믹의 색차 분석'에서 발췌하여 정리하였다.

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